WO2020134971A1

WO2020134971A1 - Refrigerator

Info

Publication number: WO2020134971A1
Application number: PCT/CN2019/123665
Authority: WO
Inventors: 青木均史; 土田俊之
Original assignee: 青岛海尔电冰箱有限公司; 海尔智家股份有限公司; Aqua株式会社
Priority date: 2018-12-27
Filing date: 2019-12-06
Publication date: 2020-07-02
Also published as: CN112204320A; JP7221519B2; JP2020106214A; CN112204320B

Abstract

A refrigerator (10). A refrigerating compartment air return passage (43) is communicated with a freezing compartment (21) by means of a suction inlet (45), and a notch area (53A) corresponding to the suction inlet (45) is arranged on the sidewall (53) of a freezer (22). Therefore, the flow of cool air around the suction inlet (45) of the freezing compartment (21) gets smother, the air volume suctioned in the freezing compartment (21) is ensured, retention of the cold air around the suction inlet (45) is prevented, and degradation of the freezing efficiency of the refrigerator (10) is avoided.

Description

refrigerator

Technical field

The present invention relates to a refrigerator that cools and stores foods and the like in a storage room, and particularly relates to a refrigerator that improves the flow of cold air at the suction port of the cooling room communicating with the return air path and its surroundings, and ensures the amount of air returned to the cooling room .

Background technique

As the existing refrigerator 100, the structure shown in FIG. 6 is known. 6 is a front view illustrating the return flow of the conventional cold air to the cooling chamber 101 of the refrigerator 100.

As shown in FIG. 6, in the cooling chamber 101 of the refrigerator 100, a defrost heater 102, a cooler 103, and an indoor fan 104 are arranged mainly from the lower side. On the right side of the cooling room 101, a refrigerating room return duct 105 is provided, and a suction port 107 is formed on the side wall 106 near the lower right end of the cooling room 101. Furthermore, the refrigerating compartment return duct 105 communicates with the cooling compartment 101 via the suction port 107.

Arrow 108 shows the cold air returning from the refrigerator compartment (not shown) to the cooling compartment 101, but the cold air changes its flow direction by approximately 90 degrees based on the bent portion 109 at the lower end of the refrigerator compartment return air duct 105, and then enters the cooling compartment 101 Inflow. Then, the cold air flowing into the cooling chamber 101 flows toward the upper side of the cooling chamber 101 based on the attractive force of the indoor fan 104, but at this time, the cold air exchanges heat with the cooler 103 to be cooled again to a desired temperature (e.g. , Refer to Patent Document 1). Patent Document 1: JP Patent Publication No. 2015-7510.

As shown in FIG. 6, in the refrigerator 100, the refrigerating compartment return duct 105 communicates with the cooling compartment 101 via the suction port 107 formed in the side wall 106 of the cooling compartment 101. Then, the cold air returned from the refrigerator compartment changes the direction of the flow by approximately 90 degrees based on the bent portion 109 at the lower end of the refrigerator compartment return air duct 105 and flows into the cooling compartment 101.

With this structure, the cold air flowing in the refrigerating compartment return air duct 105 passes through the bent portion 109 near the suction port 107 and is pushed to the lower side. Then, the cold air is kept in this state and flows into the cooling chamber 101 from the suction port 107. As a result, when the opening area of the suction port 107 is small, it is difficult to ensure the flow path area of the cold air in the suction port 107, and the air volume of the cold air drawn into the cooling chamber 101 cannot be sufficiently secured, and the cooling efficiency may deteriorate.

In addition, in the cooling chamber 101, the defrost heater 102 and the cooler 103 are arranged near the suction port 107, so that the defrost heater 102 and the cooler 103 obstruct the flow of the cold air flowing into the cooling chamber 101. Moreover, the cold air flowing into the cooling chamber 101 is not only weakened by the above-mentioned obstruction, but also the cold air is difficult to flow toward the back side of the cooling chamber 101, and the cold air cannot go to the entire cooler 103 as a whole. As a result, if the suction port 107 side of the cooler 103 is frosted, it is difficult to secure the flow path of the cold air in the cooling chamber 101, and the cooling efficiency may deteriorate.

Summary of the invention

An object of the present invention is to provide a refrigerator that improves the flow of cold air at the suction port of the cooling chamber communicating with the return air path and its surroundings, and ensures the return air volume of the cold air to the cooling chamber.

In order to achieve the above-mentioned object of the present invention, the present invention provides a refrigerator including a storage room formed inside an insulated box, a cooling room, and a return air path, the cooling room is provided with a cooling air supply to the storage room A cooler with a defrost heater installed at the lower end of the cooler to remove frost formed by the cooler; the return air path makes the cold air supplied to the storage room Return to the cooling chamber. One end of the defrost heater is detachably mounted on the cooler from the front to the back in the cooling chamber, and the other end of the defrost heater is from the front to the deep in the cooling chamber It can be detachably installed on the cooler afterwards; a suction port communicating with the return air path is formed on the side wall of the cooling chamber opposite to one end of the defrosting heater. A notch area is formed on the side wall of the cooler opposite the mouth.

Further, the notch area is provided at least on the rear side of the side wall of the cooler along the depth direction of the cooling chamber.

Further, a portion of the back wall of the cooling chamber close to the suction port expands backward to form an expansion portion.

Further, the expansion portion has a widest expansion width on the side close to the suction port, and the expansion width of the expansion portion gradually narrows in the lateral direction.

Further, the length of the expansion portion extending in the lateral direction is not less than 1/3 of the width of the cooling chamber.

Further, the cooler has multiple layers of heat transfer tubes, fins arranged on the heat transfer tubes at intervals, and the fins arranged at the lowermost layer side by side have the widest interval.

Further, in the lower region of the cooler, the spacing of the fins on the side closer to the suction port is larger than the spacing of the fins on the side farther from the suction port.

Further, the refrigerator further includes a feed air path and a damper disposed in the feed air path, the feed air path sends the cold air from the cooling chamber to the storage room; the suction The opening area of the opening is the same as or larger than the flow path area of the air damper arrangement area in the feed air path.

The technical effect of the present invention is to make the flow of the cold air returning from the return air path to the cooling chamber near the suction port of the cooling chamber smooth by forming a notch area formed on the side wall of the cooling chamber opposite to the suction port, Make sure the amount of cold air returning to the cooling chamber. In addition, the installation direction of the defrost heater on the suction port side is set at the rear side of the cooling chamber, and the installation direction of the defrost heater on the opposite side of the suction port is set at the front side of the cooling room, thereby facilitating defrost heating The loading and unloading operation of the cooler towards the lower end of the cooler.

BRIEF DESCRIPTION

1(A) is a perspective view showing the refrigerator according to the embodiment of the present invention viewed from the front; FIG. 1(B) is a side cross-sectional view showing the refrigerator according to the embodiment of the present invention.

FIG. 2 is a front view showing the air passage of the cold air circulating in the refrigerator according to the embodiment of the present invention.

3 is a perspective view showing a cooler and a defrost heater of a refrigerator according to an embodiment of the present invention.

FIG. 4 is a perspective view showing the refrigerator compartment return air passage and the cooling compartment of the refrigerator according to the embodiment of the present invention.

FIG. 5(A) is a cross-sectional view showing the refrigerator according to the embodiment of the present invention as viewed from the side wall of the cooling chamber; FIG. 5(B) is a cross-sectional view showing the refrigerator according to the embodiment of the present invention as viewed from the side wall of the cooler in the cooling room.

Fig. 6 is a front view showing the return flow of the conventional cold air to the cooling chamber of the refrigerator.

10-refrigerator; 11-insulation box; 13-liner; 13A-back wall; 13B-side wall; 14-insulation material; 14A-vacuum insulation material; 15-refrigerator room; 16-freezer room; 17 , 18, 19, 20-insulated door; 21-cooling chamber; 22-cooler; 23-compressor; 24, 25, 31, 35-partition wall; 26-freezing chamber inlet air path; 27- air supply port; 28-fan; 29-defrost heater; 30, 38-blowing outlet; 32, 44-return air outlet; 33-freezer return air path; 36-refrigerator feed air path; 37-air door; 43-refrigerator room Return air path; 45-suction port; 51-heat transfer tube; 52-fin; 53, 54-side wall; 53A-notch area; 55, 56-defrost heater fixing part; 57-glass tube; 58- Rubber support part; 59-heater cover; 63-expansion part.

detailed description

The drawings are for illustrative purposes only, and cannot be construed as a limitation to this patent; in order to better illustrate this embodiment, some parts of the drawings may be omitted, enlarged, or reduced, and do not represent the actual product size; For the personnel, it is understandable that some well-known structures and descriptions in the drawings may be omitted.

Hereinafter, the refrigerator 10 according to the embodiment of the present invention will be described in detail based on the drawings. In the description of this embodiment, the same reference numerals are used for the same members in principle, and redundant descriptions are omitted. In the following description, the up-down direction indicates the height direction of the refrigerator 10, the left-right direction indicates the transverse direction of the refrigerator 10, and the front-back direction indicates the depth direction of the refrigerator 10. The above-mentioned left-right direction shows the left-right direction when the refrigerator 10 is viewed from the front.

FIG. 1(A) is a perspective view illustrating a schematic structure of a refrigerator 10 according to an embodiment of the present invention, and is a view seen from the front of the refrigerator 10. 1(B) is a side cross-sectional view illustrating a schematic structure of a refrigerator 10 according to an embodiment of the present invention. FIG. 2 is a front view illustrating the air passage of the cold air circulating in the refrigerator 10 according to the embodiment of the present invention. In addition, the direction of the cold air circulation is indicated by an arrow.

As shown in FIG. 1(A), the refrigerator 10 includes a heat insulation box 11 as a main body, and a storage room for storing food and the like is formed inside the heat insulation box 11. As the storage compartment, a refrigerator compartment 15 (refer to FIG. 1(B)) and a freezer compartment 16 (refer to FIG. 1(B)) are formed from the upper stage.

The

heat insulation doors

17 and 18 are used to open or close the opening of the front surface of the refrigerator compartment 15 of the heat insulation box 11. Regarding the heat insulation door 17, the upper and lower ends of the right side are rotatably mounted on the heat insulation box 11 as viewed from the front, and as for the heat insulation door 18, the upper and lower ends of the left side are rotatably mounted on the partition On the hot box 11.

The

heat insulation doors

19 and 20 are used to open or close the opening of the front surface of the freezer compartment 16 of the heat insulation box 11. Regarding the heat insulation door 19, the upper and lower ends of the right side are rotatably mounted on the heat insulation box 11, and as for the heat insulation door 20, the upper and lower ends of the left side are rotatably mounted on the partition On the hot box 11.

As shown in FIG. 1(B), the heat-insulating box 11 as the main body of the refrigerator 10 includes: a steel plate outer casing 12 with an open front surface; and an open front surface of the casing 12 provided with a gap inside Lining 13 made of synthetic resin. The gap between the casing 12 and the liner 13 is filled with a heat insulating material 14 made of foamed polyurethane. In addition, the

heat insulation doors

17, 18, 19, and 20 also have a heat insulation structure similar to the heat insulation box 11.

In addition, a plate-shaped vacuum heat insulation material 14A is disposed between the outer shell 12 and the heat insulation material 14 on the back side and the left and right side surfaces of the heat insulation box 11, and further, the heat insulation of the heat insulation box 11 Can be improved. Then, an aggregate of fibers, such as glass, which is the vacuum heat insulating material 14A, is stored in a storage bag made of a metal film such as aluminum, and the inside of the storage bag is placed in a vacuum state.

Behind the freezing compartment 16, a cooling compartment 21 is formed. Inside the cooling chamber 21, an evaporator is arranged as a cooler 22 for cooling the air circulating in the refrigerator 10. The cooler 22 is connected to a compressor 23, a radiator (not shown), and a capillary tube (not shown) via a refrigerant pipe (not shown), and constitutes a vapor compression type refrigeration cycle circuit.

In the cooling chamber 21, a fan 28 is arranged above the cooler 22. The fan 28 is, for example, an axial fan. The fan 28 operates so that the cold air cooled by the cooler 22 circulates in the refrigerator compartment 15 and the freezer compartment 16. The refrigerating compartment 15 is cooled to the refrigerating temperature range, and the freezing compartment 16 is cooled to the freezing temperature range. Furthermore, below the cooler 22 of the cooling chamber 21, a defrosting heater 29 is arranged, and the defrosting heater 29 is energized during defrosting operation to remove frost condensed by the cooler 22.

Between the freezing chamber 16 and the cooling chamber 21, a freezing chamber feed air path 26 partitioned by partition walls 24, 25 made of synthetic resin is formed. The partition wall 24 partitions the cooling chamber 21 and the freezer compartment feed air passage 26, and the partition wall 25 partitions the freezing compartment 16 and the freezer compartment feed air passage 26. Furthermore, an air supply port 27 is formed in the upper part of the partition wall 24, and cold air is supplied from the air supply port 27 to the freezer compartment feed air path 26.

In the partition wall 25, a plurality of outlets 30 for sending cold air to the freezing compartment 16 are formed, and the cooling air is sent to the freezing compartment 16 from the outlet 30. In addition, at the lower part of the partition walls 24 and 25, a partition wall 31 made of synthetic resin is arranged, and a return air port 32 and a return air path 33 for returning the cold air in the freezing chamber 16 to the cooling chamber 21 are formed.

As shown in the figure, the heat insulation partition wall 34 partitions the refrigerator compartment 15 and the freezer compartment 16 in the height direction. A partition wall 35 made of synthetic resin is arranged behind the refrigerator compartment 15, and between the partition wall 35 and the liner 13, a refrigerator compartment feed air path 36 is formed. Furthermore, the refrigerator compartment feed air passage 36 communicates with the freezer compartment feed air passage 26 via a damper 37. By the opening and closing operation of the damper 37, the cold air cooled by the cooling chamber 21 is sent to the refrigerating chamber feed air passage 36. In addition, the partition wall 35 is formed with a plurality of air outlets 38 for sending cold air to the refrigerator compartment 15.

As shown in FIG. 2, the area surrounded by the broken line 41 is the refrigerating compartment 15, and the area surrounded by the broken line 42 is the freezing compartment 16. In addition, for convenience of explanation, the structure related to the air passages such as the refrigerator compartment feed air passage 36 and the freezer compartment feed air passage 26 is shown in solid lines.

The refrigerating compartment feed air passage 36 for supplying cold air to the refrigerating compartment 15 is arranged in the central portion of the rear surface of the refrigerating compartment 15, and a plurality of air outlets 38 are formed in the refrigerating compartment feed air passage 36. As indicated by the arrows, the cold air supplied from the cooling chamber 21 (refer to FIG. 1(B)) is not only sent out into the refrigerating chamber 15 from the blower outlet 38 provided at the uppermost part of the refrigerating chamber 15 but also from the The blower outlet 38 with a smaller opening in the lower channel is sent out into the refrigerator compartment 15. With this structure, cold air can be efficiently supplied to the entire room of the refrigerator compartment 15.

On the back of the right side of the freezer compartment 16, a refrigerating compartment return air passage 43 is formed. The cold air circulating in the refrigerating compartment 15 flows into the refrigerating compartment return air passage 43 from the air return opening 44 provided on the lower right side of the refrigerating compartment 15. Furthermore, the refrigerating compartment return air passage 43 communicates with the cooling compartment 21 via the suction port 45 provided on the lower right side of the cooling compartment 21. The cold air flowing through the refrigerating compartment return air passage 43 is sucked into the cooling compartment 21 from the periphery of the right end surface of the defrosting heater 29 disposed in the cooling compartment 21.

A freezer compartment feed air path 26 for supplying cold air to the freezer compartment 16 is provided on the entire back surface of the freezer compartment 16, and the freezer compartment feed air channel 26 is formed with a plurality of air outlets 30. As indicated by the arrow, the cold air supplied from the cooling chamber 21 (see FIG. 1(B)) is gradually sent out from the upper portion of the freezing chamber 16 into the freezing chamber 16 through the outlet 30. Then, the cold air is circulated in the freezing compartment 16, and after cooling the freezing compartment 16, it flows into the freezing compartment return air passage 33 (refer to FIG. 1(B)) through the return air port 32 provided in the lower part of the freezing compartment 16, and thereafter, It is sucked into the cooling chamber 21.

3 is an exploded perspective view illustrating the cooler 22 and the defrost heater 29 of the refrigerator 10 according to the embodiment of the present invention, and is a view from the front of the refrigerator 10. 4 is a perspective view illustrating the refrigerating compartment return air passage 43 and the cooling compartment 21 of the refrigerator 10 according to the embodiment of the present invention, and is a view from the rear of the refrigerator 10. 5 is a diagram illustrating a structure within the cooling chamber 21 of the refrigerator 10 according to the embodiment of the present invention, (A) is a cross-sectional view illustrating the shape of the suction port 45 viewed from the cooling chamber 21 side, and (B) is a diagram illustrating from A cross-sectional view of the side wall 53 of the cooler 22 viewed from the cooling chamber 21 side.

As shown in FIG. 3, the cooler 22 includes a plurality of heat transfer tubes 51 arranged in multiple rows, a plurality of fins 52 arranged side by side at predetermined intervals in the heat transfer tubes 51, and heat transfer tubes for each layer A pair of side walls 53, 54 supported by 51, and defrost heater fixing portions 55, 56 provided at the lower ends of the side walls 53, 54.

The heat transfer tube 51 is, for example, an aluminum alloy tube, and the fin 52 is formed of a plate material made of aluminum alloy. In the present embodiment, the number of layers of the heat transfer tube 51 is seven, and the interval between the fins 52 of the seventh layer as the lowermost layer is the widest, and the interval of the fins 52 of the sixth layer is higher than that of the seventh layer Slightly narrow. The fins 52 of the first layer to the fifth layer are arranged at a uniform interval and are slightly narrower than the sixth layer.

Specifically, in the region on the lower right side of the cooler 22, the interval between the fins 52 arranged from the fifth layer to the seventh layer is larger than the interval between the fins 52 in the left region. In addition, the interval between the fins 52 of the seventh layer is the widest, and gradually narrows from the seventh layer toward the sixth and fifth layers.

The defrosting heater fixing portion 55 is formed on the lower end side of the side wall 53 and is opened to the rear side of the cooler 22 in a substantially U-shape. On the other hand, the defrosting heater fixing portion 56 is formed on the lower end side of the side wall 54 and is opened toward the front side of the cooler 22 in a substantially U-shape.

The defrost heater 29 is, for example, a resistance heating type heater, and includes a glass tube 57 that houses a heater wire (not shown), a rubber support 58 that blocks both ends of the glass tube 57, and The heater cover 59 of the glass tube 57 is covered from above. In addition, the rubber support portions 58 and the heater cover 59 on both ends of the defrost heater 29 are fitted into the openings of the defrost heater fixing portions 55 and 56 respectively, thereby fixing the defrost heater 29 to the cooler 22 Below.

As shown in FIG. 4, the refrigerating compartment return air passage 43 is composed of a tubular member made of synthetic resin, communicates with the refrigerating compartment 15 via the return air port 44 (refer to FIG. 2 ), and communicates with the cooling compartment 21 via the suction port 45 (refer to FIG. 2) Connected. Furthermore, the refrigerating compartment return air passage 43 is the back of the right side of the freezing compartment 16 and is arranged in the vertical direction of the cooling compartment 21.

The refrigerating compartment return air passage 43 extends linearly in the vertical direction, and is bent at a substantially right angle on the lower end side of the cooling compartment 21 to communicate with the cooling compartment 21. Here, the cold air flowing in the refrigerating compartment return air passage 43 is pushed downward in the zigzag area of the refrigerating compartment return air passage 43 indicated by the circle symbol 61, which affects the smooth flow of the cold air.

However, in the present embodiment, as indicated by the circle symbol 61, in the meandering region of the refrigerating compartment return air path 43, by making the surface where the cold gas collides with the curved surface as gentle as possible, the cold air becomes easier to the cooling compartment 21 inflow.

In addition, around the suction port 45 (refer to FIG. 2) of the cooling chamber 21 indicated by the circle symbol 62, a refrigerator 10 is formed on the back wall 13A of the liner 13 (refer to FIG. 1(B)) constituting the cooling chamber 21. The swelled portion 63 swelled on the rear side in the depth direction. The right end of the expansion portion 63 near the suction port 45 has the widest expansion width, and the expansion width of the expansion portion 63 gradually narrows from right to left, and the expansion portion 63 extends at least in the lateral direction of the cooling chamber 21 About 1/3 of the distance.

In addition, by forming the expansion portion 63 in the back wall 13A of the cooling chamber 21, the thickness of the heat insulating material 14 (see FIG. 1(B)) is reduced, and the arrangement area of the expansion portion 63 can be easily considered in terms of the ease of cooling. Make any design changes based on fluidity and thermal insulation.

As shown in FIG. 5(A), a side wall 13B on the right side of the inner liner 13 (refer to FIG. 1(B)) constituting the cooling chamber 21 is formed with a cooling chamber return air passage 43 communicating with the cooling chamber 21吸口45。 45 suction port. Moreover, the side wall 13B fits the formation area of the expansion portion 63, and the periphery of the lower end portion thereof protrudes toward the rear side in the depth direction of the refrigerator 10. As shown in FIG. 4, the right end of the back wall 13A has the widest expansion width, so the side wall 13B also has the widest protrusion width.

The suction port 45 is mainly formed in a region opposed to the defrost heater fixing part 55 of the side wall 53, and is also expanded to be formed in the arrangement region of the expansion part 63. In addition, the opening area of the suction port 45 is the same as or wider than the flow path area of the area where the damper 37 (see FIG. 2) is arranged in the refrigerating compartment feed air path 36. With this structure, the air volume of the cold air sucked into the cooling chamber 21 is ensured, the cold air is prevented from staying around the suction port 45 of the refrigerating chamber return air passage 43, and the cooling efficiency of the refrigerator 10 is prevented from being deteriorated.

As shown in FIG. 5(B), the side wall 53 of the cooler 22 and the end surface of the defrost heater 29 partially overlap the formation area of the suction port 45 in the width direction of the cooling chamber 21. As shown in FIG. 3, the defrosting heater fixing portion 55 of the cooler 22 opens toward the rear of the arrangement area side of the expansion portion 63. That is, the defrost heater fixing portion 55 is formed on the front side of the side wall 53 so that the defrost heater 29 can be supported even if the rear side of the side wall 53 is cut off.

With this structure, a notched region 53A is formed on the side wall 53 of the region facing the suction port 45. Moreover, the notch region 53A is formed not only in the region facing the suction port 45 but also above the suction port 45. As a result, based on the side walls 53 and the end surfaces of the defrost heater 29, the flow of cold air flowing from the refrigerating compartment return air passage 43 to the cooling compartment 21 is not hindered. Moreover, the cold air easily flows into the back side of the cooling chamber 21 by utilizing the space of the expansion portion 63 and the notch region 53A.

Furthermore, as shown in FIG. 3, in the lower right region of the cooler 22, from the fifth layer to the seventh layer, the distribution of the fins 52 of each layer gradually becomes sparse. With this structure, the flow path of the cold air in the cooling chamber 21 is ensured, and the cold air drawn into the cooling chamber 21 from the suction port 45 passes through the space between the expansion portion 63 (see FIG. 4) and the fin 52 and is smoothly transmitted to the entire cooler twenty two. As a result, even when frost is formed on the suction port 45 side of the cooler 22, cold air can be transmitted to the entire cooler 22, preventing the cooling efficiency of the refrigerator 10 from being deteriorated.

In addition, in the cooling chamber 21, in order to smoothly flow the cold air around the suction port 45, the defrosting heater fixing portion 55 is formed to open toward the expansion portion 63 side of the rear of the cooler 22. On the other hand, the defrosting heater fixing portion 56 is formed to open toward the front side of the cooler 22. In the depth direction of the cooling chamber 21, the directions of the openings are different from each other, so that the space of the expansion portion 63 can be used to attach and detach the defrost heater 29.

For example, in the manufacturing process after installing the cooler 22 and the defrosting heater 29 in the refrigerator, when the defrosting heater 29 is disconnected, the space of the expansion portion 63 can be used from the defrosting heater fixing portion Remove the defrost heater 29 on the 55 side. As a result, although the structure inside the cooling chamber 21 is narrow, it is considered that the defrosting heater 29 can be installed and removed.

In addition, in this embodiment, the case where the suction port 45 is formed near the right lower end of the cooling chamber 21 has been described, but it is not limited to this case. For example, the suction port 45 may be formed near the lower left end of the cooling chamber 21. In this case, by forming the defrost heater fixing portion 55 and the expansion portion 63 also on the left side of the cooling chamber 21, the same effects as the above-mentioned effects can be obtained. In addition, various changes can be implemented without departing from the gist of the present invention.

Claims

A refrigerator is characterized by comprising:

Storage room, which is formed inside the insulated box;

A cooling chamber equipped with a cooler that cools the cold air supplied to the storage chamber, and a defrost heater installed at the lower end of the cooler to remove frost formed by the cooler ;as well as

A return air path that returns the cold air supplied to the storage compartment to the cooling compartment,

One end of the defrost heater is detachably mounted on the cooler from the front to the back in the cooling chamber, and the other end of the defrost heater is from the front to the deep in the cooling chamber Can be detachably installed on the cooler,

A suction port communicating with the return air path is formed on the side wall of the cooling chamber opposite to one end of the defrost heater,

A notch region is formed in the side wall of the cooler opposite to the suction port.
The refrigerator according to claim 1, wherein the notch area is provided at least on the rear side of the side wall of the cooler in the depth direction of the cooling chamber.
The refrigerator according to claim 1, wherein:

A portion of the back wall of the cooling chamber close to the suction port expands backward to form an expansion portion.
The refrigerator according to claim 3, wherein

The expansion portion has a widest expansion width on the side close to the suction port, and the expansion width of the expansion portion gradually narrows in the lateral direction.
The refrigerator according to claim 3, wherein

The length of the expansion portion extending in the lateral direction is not less than 1/3 of the width of the cooling chamber.
The refrigerator according to claim 1, wherein:

The cooler has multiple layers of heat transfer tubes, fins arranged on the heat transfer tubes at intervals, and the fins of the lowermost layer are arranged side by side with the widest interval.
The refrigerator according to claim 6, wherein:

In the lower region of the cooler, the spacing of the fins on the side closer to the suction port is greater than the spacing of the fins on the side farther from the suction port.
The refrigerator according to claim 1, wherein:

The refrigerator also includes:

A feed air path that sends the cold air from the cooling chamber to the storage chamber; and

A damper, which is arranged on the feed air path,

The opening area of the suction port is the same as or larger than the flow path area of the air damper arrangement area in the feed air path.